What's going on in the brains of people who don't need much sleep?

I’ve been doing six hours or less for the past few years. Some nights only two or three. Most days I feel fine, but every few weeks I’ll have one day where I just feel drained, and about once every couple of weeks I’ll have an eight hour sleep. So I’m very interested in what this research will determine, because if I need to be getting more sleep than I’ll need to start approaching things differently and/or see a doctor.

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